root/ROOT/REveDataTable.hxx

0001 // @(#)root/eve7:$Id$
0002 // Authors: Matevz Tadel & Alja Mrak-Tadel: 2006, 2007, 2018
0003
0004 /*************************************************************************
0005  * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
0006  * All rights reserved.                                                  *
0007  *                                                                       *
0008  * For the licensing terms see $ROOTSYS/LICENSE.                         *
0009  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
0010  *************************************************************************/
0011
0012
0013 #ifndef ROOT7_REveDataTable
0014 #define ROOT7_REveDataTable
0015
0016 #include <ROOT/REveElement.hxx>
0017
0018 namespace ROOT {
0019 namespace Experimental {
0020
0021 class REveDataCollection;
0022
0023 class REveDataTable : public REveElement
0024 {
0025 protected:
0026    const REveDataCollection *fCollection{nullptr};
0027
0028 public:
0029    REveDataTable(const std::string& n = "REveDataTable", const std::string& t = "");
0030    ~REveDataTable() override {}
0031
0032    void SetCollection(const REveDataCollection *col) { fCollection = col; }
0033    const REveDataCollection *GetCollection() const { return fCollection; }
0034
0035    void PrintTable();
0036    Int_t WriteCoreJson(nlohmann::json &cj, Int_t rnr_offset) override;
0037
0038    void AddNewColumn(const std::string& expr, const std::string& title, int prec = 2);
0039 };
0040
0041 //==============================================================================
0042
0043 class REveDataColumn : public REveElement
0044 {
0045 public:
0046    enum FieldType_e { FT_Double = 0, FT_Bool, FT_String };
0047
0048 protected:
0049 public:
0050    TString fExpression;
0051    FieldType_e fType; // can we auto detect this?
0052    Int_t fPrecision{2};
0053    TClass* fClassType{nullptr};
0054
0055    std::string fTrue{"*"};
0056    std::string fFalse{" "};
0057
0058    std::function<double(void *)> fDoubleFoo;
0059    std::function<bool(void *)> fBoolFoo;
0060    std::function<std::string(void *)> fStringFoo;
0061
0062
0063 public:
0064    REveDataColumn(const std::string& n = "REveDataColumn", const std::string& t = "");
0065    ~REveDataColumn() override {}
0066
0067    void SetExpressionAndType(const std::string &expr, FieldType_e type);
0068    void SetExpressionAndType(const std::string &expr, FieldType_e type, TClass* c);
0069    std::string GetFunctionExpressionString() const;
0070    void SetPrecision(Int_t prec);
0071
0072    std::string EvalExpr(void *iptr) const;
0073    bool hasValidExpression() const;
0074 };
0075
0076
0077 } // namespace Experimental
0078 } // namespace ROOT
0079 #endif